hm5216805 Renesas Electronics Corporation., hm5216805 Datasheet - Page 33

• Manufacturer Part Number: hm5216805
• Description: 16 M Lvttl Interface Sdram 100 Mhz/83 Mhz 1-mword 8-bit 2-bank/2-mword 4-bit 2-bank - Hitachi Semiconductor
• Manufacturer: Renesas Electronics Corporation.

Read command to Precharge command interval (same bank): When the precharge command is
executed for the same bank as the read command that preceded it, the minimum interval between the two
commands is one cycle. However, since the output buffer then becomes High-Z after the cycles defined by
l
during burst read. To read all data by burst read, the cycles defined by l
from the final data output to precharge command execution.
READ to PRECHARGE Command Interval (same bank): To output all data
CAS Latency = 1, Burst Length = 4
CAS Latency = 2, Burst Length = 4
CAS Latency = 3, Burst Length = 4
HZP
Command
Command
Command
CLK
CLK
CLK
, there is a possibility that burst read data output will be interrupted, if the precharge command is input
Dout
Dout
Dout
READ
READ
READ
CL=1
CL=2
out A0
CL=3
out A0
out A1
HM5216805 Series, HM5216405 Series
out A2
out A1
out A0
PRE/PALL
PRE/PALL
PRE/PALL
l
EP
out A3
out A2
out A1
= 0 cycle
l
EP
= -1 cycle
l
EP
= -2 cycle
out A3
out A2
EP
must be assured as an interval
out A3
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